Method for manufacturing ribbed pipes



K. WINKELMULLER METHQD FOR MANUFACTURING RIBBED PIPES Filed Aug. 5, 1921 Patented Oct. 30, 19,23.

umrao sures l dimtt PATENT caries METHOD FOR MANUFACTURINGRIBBED PIPES.

Application filed August 5, 1921. Serial 1%. 490,131.

T all whom it my concern:

Be it known that I, KARL WrNKnLMt'ILLnR,

a citizen of the German Republic, residing at Leipzig-Lindenau, Germany, have invent.-

5 ed certain new and useful Improvements in Methods for Manufacturing Ribbed Pipes, of which the followin is a, specification.

The shrinkingon o flanged disks of sheet metal u n the. tube which serves as core for the production of ribbed pipes such as used in heating or cooling plants is rather expensive when large quantities of such disks have to be shrunk on. It has already been proposed to mount the disks on the tube in the 16 cold way by pressing the same vagainst the tube through rolling in the flange ,This

method suffers however from the inconvenience that theroller exerts a pressure upon the flange only at one point so that the fix- 20 ing of the flange by rolling requires much time and that, owing to the unavoidable permissible deviations of the diameter of-the core tube, an unnecessary rotation of the disk of sheet metal is caused before any of as the parts of the flanged edge can be pressed against the core tube. These inconveniences are avoided according to this invention. In order that the invention may be clearly understood, I shall proceed to describe the same with reference -to the working method illustrated by way of example in the accompanying drawing,

wherein Fig. 1 shows in horizontal section by way of example an arrangement for the execution of the method.-=- Fig. 2 is'a vertical section of Fig, 1.

a designates the core tube and b the flan e of the disk 0 of sheet metal. Two jaws A, 40 are used which have circular cavities chrresponding approximately with the outer diameter of the flan e b. Each jaw A, B has an extension C, 1% respectively in which a threaded boring is provided which is designed to receive the screw spindle E. The part of the spindle E which corre ends with the extension C has a left hand t read, the other part, corresponding with the extension D havin a right hand tread or inversely. A han wheel F serves for rotating the spindle E. G are bearings for the spindle E. a

If now the hand wheel F is turned so that spindle E rotates so that the jaws-A and B are moved the one towards the other, a pressure is simultaneously exerted upon all points of the flange so that the flange is uniormly pressed against the tube a with the exception of the points which are situated in the gap 8 between the jaws. The material. of the compressed flange b can thus be pressed into the ga 8 when the diameter of the core tube a shou d be smaller thanthe inner diameter of the flange gwing to the-unavoidable I permissible deviation from the normal diameter. The material which has been premed into the gap 8 forms a fold f (Fig. 1) upon the outer surface of the flanged edge which serves to ensure the adhesion of the sheet iron disk upon the core ipe and further the secure position of the ri sunder the thermic stress totwhich the ribbed pipe is submitted I in service.

The spindle for operating the jaws is given b way of example only and can be 7 replace by any other convenient device.

I claim A. method for the manufacturing of ribbed pipes consisting in producing on the inner edge of the annular disk designed to form the rib a, flange the inner diameter of which is slightly greater than the outer diameter of the pipe, in pushing-the flanged annular plates on the pipe and in compressing the flanges oftsaid annular disks while in the 8-" cold state by means of a pressing machine so that the inner surface of the flange is tightly pressed upon the pipe the excess metal of the flange being formed by extrusion into two heads. i

- In testimony whereof I aflix my signature in presence of two witnesses.

KARL WINKELMULLER. Witnesses:

Bnn'rnonn MOUASELY, GERTRAUDE BACHMANN. 

